Cutaneous involvement by angioimmunoblastic T-cell lymphoma: a unique histologic presentation, mimicking an infectious etiology.

Angioimmunoblastic T-cell lymphoma (AILT) is an aggressive peripheral T-cell lymphoma that is frequently accompanied by a cutaneous eruption. The cutaneous findings most commonly consist of a maculopapular eruption on the trunk. However, purpura, infiltrated or urticarial plaques, papulovesicular lesions, nodules, and erythroderma have also been reported. Histologic findings in the lymph node are characteristic, while those in the skin may show one of four patterns. Here, we review the previously reported histologic patterns and present a case of AILT involving the skin with a unique histologic appearance of necrotizing granulomas with abundant histiocytes and eosinophils, mimicking an infectious etiology.